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Groups, captures and backreferences

·

hard

Say it twice

Find a word repeated immediately after itself, separated by a single space. Capture the repeated word.

//

Corpus

Steps0/ 1,002 · par 334
Every input, what the pattern matched in it, and what each group captured
InputMatchSteps
12 matches36
12 matches36
6 matches18
9 matches27
16 matches48

Trace

Select an input to step through what your pattern did to it.

Cmd-Enter submits too.